A farmer and his son used 20 days to weed a plot of land . If the farmer uses 36 days to weed the same plot of land , how many days will the son use to weed the same plot of land


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Question Number 189872 by otchereabdullai last updated on 23/Mar/23

$A f a r m e r a n d h i s s o n u s e d 20 d a y s$ $t o w e e d a p l o t o f l a n d . I f t h e f a r m e r$ $u s e s 36 d a y s t o w e e d t h e s a m e p l o t o f$ $l a n d, h o w m a n y d a y s w i l l t h e s o n$ $u s e t o w e e d t h e s a m e p l o t o f l a n d$
	Answered by Frix last updated on 23/Mar/23

	$\frac{1}{f} + \frac{1}{s} = \frac{1}{20}$ $f = 36$ $\frac{1}{s} = \frac{1}{20} - \frac{1}{36} = \frac{1}{45} \Rightarrow$ $s = 45$
	Commented by otchereabdullai last updated on 23/Mar/23

	$t h a n k s s i r! a m m u c h g r a t e f u l$
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